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LONG ISLAND SINCLAIR TIMEX GROUP

INCORPORATING % NYTSE OF NEW YORK CITY
ISSUE: __ FEBRUARY 1990

Ж МЕН YORK TIMEX SINCLAIR ENTHUSIASTS: NEXT MEETING MARCH 11, 1930

LIST MEMBERSHIP IS 545,00, LIBRARY TAPES ARE AVALIABLE, HAITE THE 5
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LISTING TZSUE LISTING
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с HOSTEL LISTING ROSTA | EA АШАСА aA di DIG
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STING NO: SUE.CE TETING N ed a a aoa
дате 218 ZTING. НОТА ВІ |
A ISSUE TITALGIA ISzUE
LIST тнт В, ISSE ЪТЪТЕ ;

FL y ete ne, NES шеш тє ча че те 45 эе әш же тё өз ae з та С пут пп өч өң
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11957;
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нм
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а а a ad А AS I AM WRITING, STONEY
РЕ 3. HAR TELEPHONES ТО REFJORTSMUG ІЗ
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eid FORBERT= ee a а алы ыы ы ыы а MEE EE TRE ы ыы

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EETLEEH Zi 37. SHO zz ST.

MEETINGS ТЕБЕТ 7:28 FH.

Ai т пей

sa aa'aa azana aaas aaan nsaan aranan ЉЕЕК МО Е
OF ЕРЕ 1
COMING EVENTS - СОНЕ ТЕБ T
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Е HEET ING TING шоп
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накы MEETING То INTERES

ORDER E CONTRI
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STONEY БЕРОБТЕС THAT TRENTON
STATE COLLEGE REFUSES TO HOST
THE COMPUTER FES
THE AMATEUR COME
M. J. LH e c RGAN =
THE COMPUTER FEZ
FOR АМ ALTERNATE

Пи Па)

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WANTED.

FORM =
FRED REPORTED THAT НЕ HAS хем
ANSI МУ INQUIRIES ABOUT

PROG БЕЗ. EUT NO ONE HAS

YET СНЕСЕ TO Е! ВСЕ AN

pe

ш-часгсласок-

Wrapping
FRCUDE
WORD РКОС5
AERCO INT
TALK CLOCK
ZTALK
INVOICING
BLURYTHHS
READER 1

10 READER 2
11 TRACE

12 RENUMBER
13 CASE SWAP
14 VARS

15 SCROLL

16 SCROLL

17 SCROLL

18 OVERS 1!

19 OVERS 2

20 PATTERNS 1
21 PATTERNS 2
22 PAINTING
23 PICTURE

24 FLAG

25 FILE

26 ANDROIDS
27 вас

28 SIMON SAYS
29 FINAL

30 TEST

ЗІ SECUNDS

32 NAVIGATION
33 SQ ROOT

34 UP 4 DOWN
35 DIG. TIMER

37 BEWARE DOG
28 EXAM

39 FEYBUARD M

40 LAS VEGAS

| PARROT

42 KENTACKY
AJ СІМ

44 МС
5 SHAKESPEARE

EXAMPLE

PAPER & INK

LIST TAPE LISTINGS

is a listing of the
programs on LIST tape #9. These are
all 2068 programs. To get this tape
or any of the other LISI tapes, send
$6.00, OR a QUALITY 60 minute tape and
$3.00 to Harvey Rait, at the address
in the box оп the first page. Better
yet, come to the meetings and pay only
$1.50 per tape (call or write Harvey
first so he can have the tape(s)
ready).

The following

46 TRESURE H
A7 I.T. ONE

48 THE I.T.

49 WOLF & GOATS
50 RACER

51 AT MARKET
52 WINDOWS

53 STICKS

54 NEW CHR$
55 NEW CHR$
56 NEW СНАФ
57 NEW CHR*
58 MESSAGE

59 TITLEHAKER
60 REGRESSION
61 BAR GRAPH
62 SCROLLS

63 AUTUMN

64 NO. SORT
65 WORD SORT
66 DERBY DAY
67 ATTR TABLE
68 METRIC

69 HEADER

70 HEADER/C
71 SEARCH

72 S/DATA

73 DEMOLITION

SIDE B

10
11

ОЕМОСТТТОМ
DEMOLITION
SUBMAR I NE
BRICKS
MONE YPAIL
CHOMFER
ASTEROIDS ·
TREE MAKER
MOZART WA
SANTA мазе
LOANS улвв
E Z DIS
UDG DESIGN
NETWORK.
128 CGLORS.
BANANAS
M/C LOADER
PSGE 32/64
MMI
CHARACTERS
FULLGIRLS
JANIS
CONVERSION
TIMER IC
TITLE/CUDE
BES
ATTR
2XSIZEHITE
з CHARS
TITL/SHOOT
TITL/SHOOT
PAINTSIC
SANTA
SCRAMBLER
TAPE/ANALY
MULTIFILE
SAVER
SAVER МС
TASPRINT
TASFONT о
TASPRINT
TAS2PRINT
TAS2PRINT
ТАЅРКІНТ
COMMENTS

“
From C o

THIS SET OF machine-code routinés provides
the 16K ZX-81 with 14 new Basic statements
and commands usually found only on much
larger and more expensive machines. The
routines take up 1336 bytes in a Rem
statement and are designed for ease of use
with full error codes. Two of the routines are
interrupt driven and allow you to add your
own interrupt driven routines.

То enter the program, a 16K ZX-81 with
the New run has to be used, it may be possible
to use less memory, but some of the routines
will crash if the display file is collapsed, ie.,
RAM is less than 3'AK.

First, line 1 Rem followed by 128 zeros —
four lines — is entered. This is then
duplic 4 аѕ line 2 and so on up to line 10.
When this has been done, the following are
entered as direct commands.

POKE 16511,56

POKE 16512,5

POKE 16509,0

POKE 16510,0

POKE 16514,118

POKE 16515,118

1 REM BETTA BASIC

POKE 16419,1

NEW LINE
You should now have

1 REM BETTA BASIC
on the screen, Anything else means that you
have probably done something wrong and it is

Геша
Ри на | тези | шат
CL Y ЖЕ ШР a

SIN OL Ad X.
John Judge adds 14

Basic commands to
222589 the ZX-81.

Lr

а О ЧОЙ a Чан

best to start again.

If all is well then enter the hex-loader
program 1, ignoring line 0 as this should
already be in memory. Type Run N/L then
enter the start address for the machine code
data, which will be 16514 if you are just
starting or another number if you are
continuing from another day or after saving
partly completed дага. You can now enter the
hexadecimal data, as many of the numbers as
you like before pressing Newline, but
remembering not to enter any of the spaces.
There is a check-sum number after each line
of data which you can compare with the
check-sum number on the screen, if it is
different then press S N/L and you can enter
the line that is wrong. By pressing О N/L, you
can break out of the program to save it.

Looking through data

Program 2 is for looking through the data
for any that is wrong. To use it, type Run 200
then enter the start address, Type Cont after
each screenfull.

If all the data is entered and correct, then
delete lines 5 onwards and enter program 3.
Do not use New to delete the lines. The
program is now finished and ready to use,
unless some bugs have escaped detection.

You must have Betta Basic present in the
computer before you start typing in your

Program 1. ea IF ЯФ=
1 REM gaaat ЕТС.... a4 IF A=
е SCROLL аб IF LEM
в SCROLL THEN LET я
18 PRINT AT 18,0; "START RDDRES га IF #5-
5?" Sa LET N=
15 LET Ags" -475 |
га INPUT 3 100 POKE T
за FOR Xs8 TO 17795 STEP 7 118 LET Cz
48 SCROLL 1280 PRINT
ба PRINT AT 19,0; х; 125 LET AS
55 LET c= 138 NEXT Т
ea FOR TzX TO X46 148 РКІМТ.
та IF Ag="" THEN ТНЕЦТ AS а NEXT Ж

— "e
>” QUA

program. In’ this way the machine code
routines are saved as you save your program
that uses them. Now, whenever you type
Run, the variables are initialised ready for
use.

INT: Switches on the interrupt routine by
Rand USR Int to give the following
features:

TRACE ON by POKE TRN, 1 or pressing
N/L and 1 together;

MEMORY ON by POKE TRN, 2 or
pressing N/L and 5; ;

MEM/TRACE OFF by РОКЕ TRN, 0 ог
pressing N/L and 2;

ROUTINE OFF by pressing N/L and 3 or
Fast then Slow;

Break out of any program — even machine
code — by pressing N/L and 4. This also
switches routine off;

TRACE SPEED by POKE LEN, n where
n is the length of the pause at each interrupt.
Initially 3;

USER ROUTINE: Three bytes — USE,
USE + 1 and USE + 2 — are set aside to add
to call to your own interrupt driven routine.
Initially all are NOPS. Make sure the routine
is Off by using Fast followed by Slow before
you start Poking or a crash will occur as soon
as you Poke in the first number.

When using the trace or memory left

(continued on next page)

"&" THEN RUN

"à" THEM ЗТОР
„волт (LEN АФ 2)
по THEN GOTO 70 -
1S4CODE BA$«CODE nsiz)

aM
СМ
“ "авг TO
гАф(3 TO !

2l;

+ ү%

М

е

“features, the number will take up the first five

characters in the top left corner of the screen.
These numbers are only printed up during
the interrupt and the original text or graphics
are put back into the screen before control is
handed back to the ROM. So as far as the
ROM is concerned, the numbers do not even
exist on the screen and so will not be “іп the
way". But it is important not to use the
Sinclair scroll command as this will cause a
crash after 23 scrolls.

Pressing N/L and 4 will break out of any
machine code programs as long as the routine
is switched on by Rand USR Int.

The Trace and Memory Left routines will
automatically switch off when program
execution ends or any error occurs, though
they can operate in command mode by using
N/L and the function keys | to 5.

The interrupt routine will be switched off
by any of the following: Fast, Copy, LPrint,
LList, Save, Load, Pause, New or by entering
a line. If any of these are used then do not
forget to switch on again by using Rand USR
Int before using Trace or Memory Left.

LOC: This moves VARS up to Eline so that
all the variables temporarily disappear and

ERROR CODES.
variable not found, eg., R$ Іп Rep,
Proc name etc
out of memory
integer out of range, le a number
less than 0 or greater than 65535
has been used in a routine
number error, le a number or
expression has been left out or does
not make sense so the computer
can not change И to an integer for It
to use.
break
missing ;
too many repeats (max 17)
syntax error, eg no data or
expressions
missing
until without repeat
R$ error, eg., R$ has been DIMed or
is too short so that Rep and Unt can
not use it.
Rand too high for LST

X Proc name error, eg too short
(minimum three characters or non-
existant ' .
Incorrect string variable in line afte
DYN

Program 2.

Дей ТОР
гора PRINT
Біз

сете

JU ru ur

Ее

ш ИЛ + " n

ra pma mà pa po na |
2 Ua a Cnr

zd

E Cau И

Р

Ca tat

“load variables” can be
used instead, ie., variable names
can be used for a second time without
altering any or the original variables of values
eg.

VAR: Restores original variables after using
LOC. Do not use unless LOC has been used
first. For example:

RAND USR VAR.

SCL: Stands for Scroll. Do not use the
scroll provided by Sinclair as it will cause
some of the routines to crash. For example:

RAND USR SCL.

In the following, X and Y can be апу
numberical argument in the range 0 to 65535,
V any numerical variable, | any numerical
dummy variable that is not used for anything
else, anything surrounded by [] is optional, all
Print statements will be changed to Rem by
the routine, and should be changed back to
Print if ever the line is edited. The Print lines
after the USR lines hold the arguments for
each routine.

Function has three uses

PRT: This has three uses, two of which are

concerned with the ports.

a) OUT (port), byte. For cxample:

10 LET | = USR РАТ

20 PRINT Х, Y[;X,Y....]

b) IN variable, (port) or LET variable = IN
(port). For example:

10 LET! = USR PAT

20 PRINT; X where X = port 0 to 255

c) LD I, X. For example: |

10 LET! = USR РАТ

20 PRINT; Х where Х = char set 0 to 255
This one changes the character set and can be
used for games or with a graphics ROM —
initially 30.

REP: Same as BBC Basic Repeat. The line
numbers are stpred in R$. Up to 15 Repeats
can be nested — inside each other — before an
error occurs. For example:

10 LET! = USR REP
UNT: BBC Basic Until. Jumps back to line

after last Rep. If a testable condition is not

true. For example.

10 LET! = USR UNT

20 PRINT testable condition

ONG: Same as Оп... Go To... Jumps to
the Xth line number in a list of numbers. If X
= 0 or X > number of numbers in list then
the line after the ONG is executed. For
example:

10 LET! = USR ONG
20 PRINT X ; line [, line... |
Up to 255 lines can be put on the list.

PRC: Def Proc. This is a simulation of
procedures, using names instead of line
numbers. Each 'procedure' has the following
structure:

10 REM PROCNAME
20 Subroutine or procedure
30 RETURN
where Name will be the name of the
procedure. PRC is called only once at the
beginning of the program. For example:
10 LETI = USR PRC

The routine then searches for all the “Вега
Procname’’s and puts the names into the
variables area with their line numbers so that
a procedure can be called by:

GOSUB NAME
The name must be three or more characters
long and contain only characters legal as a
variable name, see page 38 of the Sinclair
manual. There is no space between the Proc
and the Name.

DYN: Dynamic procedure. This routine
tells you whether a name held a string variable
is a procedure or not so that it may be used
with VAL without an error occuring. If it
does not exist. eg.,

10 INPUT A$

20 IF USR DYN THEN GOTO VAL A$

30 REM AS

40 GOTO 10

The above example Gotos a procedure
entered in line 10 if it exists, otherwise it waits
for you to enter another. The A$ in lines 10,
20 and 30 can be changed to any other string
variable.

LST This is a fast scrolling list with a few
extra features. To use: ` ;
Rand line to list from Rand USR LST
In this routine you can press:

Space to break out of the routine;

Z to copy the screen to the printer;

K to “normal list" the last line on the screen
in order to edit;

D to list through slowly;

"Цео an

Cac CO Ut E C m Cf) add
ППИ ТУ ТИ iWon n dug

J D Judge, 147

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LAGI emu (peii Әт Іі Рибница diam
dC 6n OTe

ил пут
iE o m nm

address and I will send you a copy of the

finished program on tape
Hesters Way Road, Cheltenham, Gloucester-

then send £3.00 to the following
shire, GL51 OSD.

program is a bit daunting,

If the task
of typing in this

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24
25
26
27
28

REM "PLANETS"

GOTO 10020

FRINT AT 20,20;"9TH PLANET"
PRINT AT 18,10) "Ж<---------
-SUN"

PRINT AT 0,23,;"PLUTO"

PRINT RT 2,23) "DISTANCE"
PRINT RT 3,23;: "3679 MILL"

PRINT AT 4,23) "ORBIT"
PRINT AT 5,23,"248.4YRS"
FOR Тед TO 30

LET ReT/15xPI

(ЕТ зхе21+21жетн A

LET SY»22«*21X*COS Я

PLOT 5Х,5Ү
HEXT T
PAUSE 250
CLS
GOTO 2000
STOP
PRINT AT 19,18;"X4---------
-SUH"

22~PRINT RT 1,23,"PLUTO"
PRINT RT 3,23)"DISTRNCE"
PRINT RT 4,23,"2794 MILL"
PRINT RT 5,23,"ORBIT"
PRINT АТ 6,23;"164.8YRS"
PRINT RT 29,20; "тн PLANET"
FOR T=0 TO 30

ад
50
68
70
75

СЕТ НеТ/15%РІ

LET 5$Х=21+18Ж%51Н A
(ЕТ SY=22+16#COS A
PLOT 5Х,5Ү

NEXT T

PAUSE 258

с.8

сото 2500

PRINT RT 19,18:"Ж<---------

------ SUN"

&7~PRINT AT

98
99
100
110
128
125
130
148
150
379

PRINT AT 0,23, "URANUS"
PRINT AT 2,23) "DISTANCE"
PRINT AT 3,23;"1783 MILL"
PRINT AT 4,23) "ORBIT"

PRINT AT 5,2Э3›"Ә4.02 YRS"
28,20)"7TH PLANET"
FOR Тед TO 38

LET НтТ/15ЖРТ

LET 6Х=21+15%51Н А

LET SY*22*15*COS А

PLOT 6Х,5Ү

NEXT T

PAUSE 250

съв

GOTO 3000

PRINT RT 20,20,"3RD PLANET"

9,23) "EARTH"
2,23) "DISTRNCE"
3,23,"93 MILL"
4,233 "ОВВІТ"
PRINT AT 5,23›"1 YEAR"

| FOR Тед то за

393 LET ҒчТ/15ЖРІ

(ЕТ SM-21*7*SIN А

335 LET 8уе22+7#С03 A
395~LET SYe22«7XCOS A

396 PLOT ЗХ,5У

397 NEXT T
398 PAUSE 250
399 CLS

400 GOTO 5500
"00 PRINT AT

510 PRINT RT
530 PRINT RT
"40 PRINT RT
550 PRINT AT
560 PRINT AT
565 PRINT AT
600 FOR т=а TO за

610 LET ВеТ/15ЖРТ

620 LET SX"21*13*4SIN А
630 LET SY«*22*131COS A
640 PLOT SX,SY

641 NEXT T

642 PAUSE 250

643 CLS

644-GOTO 3500 .

650 PRINT RT

0,23, "SRTURN"
2,23; "DISTANCE"
3,23; "866 MILL"
4,23, "ОРВІТ"

------50Н"

651 PRINT RT
653 PRINT AT
654 PRINT AT
65% РЕТНТ ЯТ
656 PRINT AT
657 PRINT AT
700 FOR Тча TO 30

710 LET ReT/1SX*PI

720 (ЕТ SX921*10*SIN A
730 LET 5үе22%10ҰС05 А
735 PLOT SM.SY

740 NEXT Т

74% PAUSE 250

746 CLS

747 GOTO 4989

0,23, "JUPITER" .
2,23) "DISTANCE"
3,23)"483 MILL"
4,23; "ОВВІТ" : `

750 PRINT AT 10,10;"%<---------
------вин"

751 PRINT AT 8,23; "МАКЗ"
753 PRINT AT 2,23) "DISTANCE"
754“РКІНТ AT 3,23) "141 MILL"

10,10) "Ж--------- :

10,10; "ж<---------

5,23)"23.46 YRS"
20,20; "6TH PLANET"

10,10; "Ұ<---------

5,23,"11.86 YRS"
20,20;"STH PLANET"

PRINT АТ 4,23›"ОВВ1Т"

PRINT AT 5,23›"1.Ө8 YRS"
PRINT AT 20,20)"4ТН PLANET"
FOR Тед TO 60

770 LET A=T/30¥#P1

LET SM»21*8*SIN А

790 LET SY=22+8*COS А

HEXT T
сз

PLOT 6Х,5Ү
PAUSE 250

вза GOTO 5000

PRINT AT
850 PRINT AT

PRINT RT
853 PRINT RT
PRINT RT
855 PRINT RT
856 PRINT AT

20,20;"2ND PLANET"
10,1@0›"ж‹---------

@,23) "VENUS"
2,23) "DISTANCE"
3,23,"67.2 MILL"
4,23) "ORBIT"
5,23, "225 DAYS"

as? FOR Тед TO 38
858"LET Re€T^/15*PI

359

LET SMe21*4XSIN A

860 (ЕТ SYe22*«4xCOS А

861
862 НЕХТ Т

PLOT 5%,5Ү

863 PAUSE 250

CLS

865 GOTO 7000

963 PRIHT АТ
969 PRINT AT
910 FRINT RT

915 PRINT
320 FOR Тт
925 LET М”
930 LET SX
$40 LET SY
250 PLOT 8
255 NEXT T
960 PAUSE
CLS
сото в
STOP
PRINT

А PRINT
1030 PRIHT
MME GIVES"
1048 PRINT
SYSTEM"
1050 PRINT
ATED”

FRINT AT

10,10) "¥<------- --

а, 23; "MERCURY"
2, 23: "DISTANCE"
3,23,"36 MILL"
4,23; "ORBIT"
5,га: "9в DAYS"
ат 20,20;"15Т PLANET"
е TO 30

Т/15ЖРІ

=21+2¥SIN A
»22+2ж005 A

x. SY

250
оса
“THE PLANETARY SYSTEM

"THIS COMPUTER PROGRA
"DETAILS OF THE SOLAR
"AND INCLUDES AN ANIM

1060 PRINT "REPRESENTATION OF TH
E PLANETARY"

1978 PRINT

SYSTEM,"
1075 PRINT
1100 PRINT "PRESS ""NEWLINE KEY"
" то START"

1110 PRINT "YOUR JOURNEY THROUGH
TIME АНО"

1120 PRINT "S РАС Е."

1121 PRINT

1122 PRINT :

1123 PRINT """PLUTO"" ""НЕРТЏНЕ"
„ин URANUS" wn

1125 PRINT

1126 PRINT """SRTURN"" ""JUPITER
ни "имдрб"""

1128 PRINT

1129 PRINT """ERRTH"" ""VEHUS""
""MERCURY"""

1132 INPUT A%

1135 CLS

1140 IF fi&e"" THEN GOTO 1200
1200 PRIHT "PLUTO"

"ORBITS OF OUR SOLRR

1220 PRINT "THE HINTH PLRHET OF
THE SOLRR"

1230 PRINT "SYSTEM, ORBITING THE
SUM RT я"

1240 PRINT "MEAN DISTANCE OF 39.
тағ) IN"

1258 PRINT "248.4 YERRS.PLUTO НА
5 DISCOVERED"

1260 FRIHT "IN 1930 FOLLOWING ОВ
SERVATIONS"

1270 PRINT "OF PERTURBATIONS ІН

NEPTUNES"

1280 PRINT "ORBIT.PLUTOS MASS 15
PROBABLY"

1290 PRINT "LESS THAN 8.1 OF THA
T OF EARTH."

1295 PRINT "DIAMETER IS PROBABLY
"ове то"

1296 PRINT "6000 KILOMETRES AND

THE ORBIT IS"

1297 PRINT "VERY ECCENTRIC"
1298 PRINT

1299 PRINT

1300 PRINT "PRESS ""NEWLINE TO $
EE ORBIT"

1302 INPUT AS

1303 CLS

1304 IF A®=#"" THEN GOTO З
2600 PRINT "NEPTUNE"

2011 PRINT

2012 PRINT

Ty ун пун кишш ас аз au
educational routine which рго-

BB vides the user with a semi-educa-
-$ tional description of each planet,

7 followed by an animated graphic

Fm presentation of each planetary orbit.

2013 PRINT

LANET AND"

2014 PRINT "THE EIGHTH PLANET FR

ПМ THE SUN."

201% PRINT "HEPTUNE WAS FIRST DI

SCOVERED IN"

2016 PRINT "1846 BASED ON PERTUR

BATIONS IN"

2017 PRINT "THE ORBIT OF URANUS.

NEPTUNE HAS TWO MOONS, ""TRITOH""
AND " "НЕВЕ 1 р" "н

2018 PRINT "NEPTUNES
164.6 TIMES"

2819 PRINT “THAT OF EARTH.ITS DI

AMETER IS"

2020 PRINT “ABOUT 51 M^M AND ITS
MASS ABOUT"

2021 PRINT "17.45 TIMES THAT OF

THE EARTH"

2022“РКІМТ

2023 РКІНТ

2024 PRINT "PRESS ""HEMLINE"" TO
SEE ORBIT"

202% INPUT AÑ

2926 CLS

2027 ТЕ Нв!"
2500 PRINT
2515 PRINT
2528 PRINT "THE THIRD LARGEST PL
RHET IN THE"

2530 PRINT "SOLAR SYSTEM AND SEV
EHTH FROM"

2540 PRINT "THE SUH.PHYSICRLLY V
ERY SIMILRR"

2550 FRINT "TO HEPTUNE,BUT РАТНЕ

R LRRGER"

2560 PRINT "53 МАМ +7- 5 878.1TS
DISTANCE"

2570 PRINT "FROM THE SUN IS 19.2
RU RND IT"

2580 PRINT "ORBITS THE SUN ІН 84
„22 YEARS."

2590 PRINT "URANUS HAS FIVE MOON

S IN ORBITS"

2591 PRINT "THAT ARE RETROGRADE.
2592
2593
2134
ЗЕЕ
2595
2596
2597
3000
3015

"THE FOURTH LARGEST Р

НИЧЕВЕ"" IS

THEN GOTO 21
"URANUS"

PRINT

PRINT

PRINT "PRESS ""HEHLINE"" ТО
ORBIT"

INPUT A%

с.в

IF Няч"" THEN GOTO 69
PRINT "SATURN"

PRINT

3020 FRINT

ND HYDROGEN"

We are sure that it will prove use-
ful to science students and teachers.
(t was sent by K Е Williams of New
South Wales, Australia (16K Z X-81).

3025 PRINT "THE SECOND LRRGETS P

LRHET .IH THE"

3030 PRINT "SOLAR SYSTEM AHO THE
SIXTH FROM"

3035 PRINT "FROM THE SUN.IT ORBI

TS THE SUN"

3040 PRINT "IN 29.46 YEARS RT A

DISTRHCE OF"

204% PRINT "S.54RU. SRTURN HAS TH

E LOWEST"

3050 PRINT "DENSITY OF RLL OF TH
E PLANETS,"

3055 FRINT "LESS THAN THAT OF НА
TER,RND MAY"

3060 PRINT "CONTAIN OVER 60 0/0
HYDROGEN BY"

206% PRINT "MASS.ITS TOTAL MASS
15 95 TIMES"

3078 PRINT "THAT OF ERRTH.SRTURH
HAS TEN"

3075 PRINT "MOONS AND ITS MOST S
TRIKING"

2066 PRINT "FEATURE ARE THE SYST
EM OF RINGS"

3090 PRINT "16 KM THICK AND THOU
GHT TO BE"

3095 PRINT "COMPOSED OF TINY ICE
FARTICLES"

3100 PRINT

3118 PRINT

3125 PRINT "PRESS ""NEWLINE"" TO
SEE ORBIT"

3138 INPUT R$

3135 CLS

3140 IF R&»"" THEN GOTO 500

3500 PRINT "JUPITER"

3*520 PRINT

3538 PRINT

3535 PRINT "JUPITER IS THE LRRGE
ST AND MOST"

3540 PRINT "MRSSIVE IN THE SOLRR
SYSTEM AND"

3545 PRINT "IS FIFTH FROM THE SU
N. MASS IS"

3550 PRINT "317.8 TIMES THAT OF
THE EARTH."

3555 PRINT "JUPITER IS 5.28RU FR

OM THE SUN”

3560 PRINT "AND HRS RN ORBIT OF
11.86 ERRTH"

3565 PRINT "YEARS.ATMOSPHERE CON

SISTS MRINLY"

3570 PRINT "OF METHRNE,RMMONIR R

3575 PRINT ".JUPITER HAS 13 MOON

2580 PRINT "LARGEST BEING ""GANE
YMEDE"" AND"

PRINT """CRLLISTO. JUPITER H
NT "PROMINENT FERTURE CR
PRINT "RED SPOT"" THRT HRS
PRINT "FOR OVER 159 YERRS"

PRINT "PRESS ""HEHLINE"" ТО
8
IF Аве"" THEN GOTO 659

T
PRINT "MARS IS THE FOURTH P
LANET FROM"
4540 PRINT "THE SUN.WITH AN ORBI

4545 PRINT "EARTH DAYS.AND IS 1.

4550 PRINT "THE SUN. THE HIGHEST
TEMPERATURE"

4555 PRINT "AT THE EQUATOR IS AB
OUT за DEG."

4960 PRINT "АМО THE LOWEST ABOUT

4565 PRINT "CENTIGRRDE.MRRS HRS
R MERN DIRM."

4570 PRINT "OF 6759 KM,RND HRS D
ISTINCTIVE"

"POLAR ICE CAPS WITH

"RECESSION.MARS HAS T
"""PHOBOS"" AND ""DEI

"IT IS UNSURE IF MRRS
CAN SUPPORT"

4591 PRINT "LIFE AS КМОМН ON PLA

NET EARTH."

PRINT "PRESS ""HEWLINE"" TO

ТЕ R&e"" THEN GOTO 758
PRINT "ERRTH"

PRINT "PLANET EARTH IS THE
THIRD PLANET"
5950 PRINT "FROM THE SUN» AND AT

“062 PRINT "THE ONLY PLANET KNOW
Н TO SUPPORT"
$5070 PRINT "LIFE A
HE ERRTH IS"
“090 PRINT "RATHER LARGER THAN M

S WE KNOM IT.T

"AN ORBIT OF RPPROX.O
HE YERR ON"

*100 PRINT "ITS JOURNEY AROUND T
HE SUN. EARTH"

5120 PRINT "IS SLIGHLTY FLATTENE

"POLES AND IS ABOUT 1

2756 KM IN"
5140 PRINT
NOH, EARTH"
5150 PRINT "HAS ONE MOON. THE EAR
TH WAS" '
51690 PRINT "FORMED ABOUT 4550 MI
LION YEARS"
"170 PRINT "AGO AND HAS SUPPORTE
D MAN FOR"
180 PRINT ".009 0/0 OF THIS ТІМ
Е"
"190
5195
ЗЕЕ
5200
$210
5220
5500
5520

"DIAMETER.AS WE ALL К

PRINT

PRINT "PRESS ""НЕШЛНЕ"" ТО

ORBIT"

IHPUT АЖ

CLS

IF AS="" THEN GOTO 379

FRINT "VENUS"

PRINT

$530 PRINT

5540 PRINT "VENUS IS THE SECOND
PLANET FROM"

5550 PRINT "THE SUN
THE SAME"

5560 PRINT "SIZE AS THE EARTH.AN
p IS . 7280"

7570 PRINT "DISTANT FROM THE SUN
,RHD ORBITS"

$580 PRINT "THE SUN IN 225 DAYS,
ABAT TWO"

$590 PRINT "THIRDS OF AN EARTH Y

EAR."

#600 PRINT “THE SURFACE ТЕМРЕКАТ

URE 15 ABOUT" 5

3610 PRINT "750 DEGRESS К.ТНЕ SU

RFACE 15"

«620 PRINT "COMPLETELY OBSCURED

BY DENSE"

3630 PRINT "CLOUDS CONTANING SUL

PHURIC ACID"

“640 PRINT "LIFE AS WE KNOW IT C

QULD HOT"

5630 PRINT "EXIST UNDER THESE CO

NDITIONS"

5660 PRINT

7670 PRINT

3680 PRINT "PRESS ""НЕШЛНЕ"" TO
SEE ORBIT"

5690 INPUT AS

5691 CLS

5695 GOTO 849

6908 PRINT "STANDBY"

7000 PRINT "MERCURY"

7920 PRINT |

7030 PRINT қ

7040 PRINT "MERCURY IS THE PLANE
T CLOSEST TO"

7050 PRINT "THE SUN.NIGHT SURFAC
Е TEMP IS"

7060 PRINT "THOUGHT TO BE 110 DE
GRESS K,RHD"

7078 PRINT "AND MIDDAY EQUATORIA
L TEMP ABOUT”

7980 PRINT "600 DEGREES K.THUS Р

AND 15 ABOUT

RECLUDING"

2090 PRINT "LIFE RS WE KNOW IT 0
N EARTH"

7100 PRINT "MERCURY HAS LITTLE 0
R NO кноин"

7120 PRINT “ATMOSPHERE, АМО HAS N
о MOONS"

7139 PRINT "THE PLANETS AVERAGE
DENSITY IS"

7140 PRINT "5.2 GRAMS PER CUBIC

CENTIMETRE"
7150 PRINT
7160 PRINT
7170 PRINT "PRESS ""NEWLINE"" TO
SEE ORBIT"

7180 INPUT Рт

7190 CLS

7195 IF R&e"" THEN GOTO 999

2900 PRINT """ZX-81 MICRO-COMPUT
ER "өн

8020 PRINT

8030 PRINT "TRUSTS YOU HRVE ENJO
YED THIS"

8835 PRINT

8040 PRINT "LITTLE TRIP THROUGH
THE £OLRR"

8045 PRINT

8050 PRINT "SYSTEM AND THAT IT Н

RS GIVEN YOU"

8855 PRINT
8060 PRINT
A BETTER"
8065 PRINT’
вата PRINT
UNIVERSE"
8088 PRINT
в090 PRINT
8891 PRINT
8092 PRINT "ЖЖ ЖЖ ЖЖ ЖЖ ЖЖ ЭХ ЖЖ

ЖЖ ЖЖ ЖЖ xx"

8093 PAUSE 8098

8094 CLS

809% PRINT."RS A SOBERING THOUGH
T HERE ARE"

8100 PRINT "THE DISTANCES FROM T
HE SUN IN"

8200 PRINT "MILES OF EACH OF OUR

9 PLANETS"

8300- PRINT

8408 PRINT "PLUTO.....3670 MILLI
ON MILES"

A500 PRINT "NEPTUNE...2794 MILLI
DN MILES"

8510 PRINT "URANUS. ...1783 MILLI
ON MILES"
8520 PRINT "ВАТИРН....866.2 MILL
ION MILES"
8530 PRINT "JUPITER...483.3 MILL
ION MILES"
8540 PRINT "MRRS......141.5 MILL
тон MILES"
8558 PRINT "ERRTH.....93 MILLION
MILES"
8560 PRINT "VENUS.....67.2 MILLI
ON MILES"
8570 PRINT "MERCURY...36 MILION
MILES"
8580 PRINT
8590 PRINT "IT TAKES SUNLIGHT В.
33 MINUTES" i
8595 PRINT "TO REACH EARTH AT 18
6000 MILES"
8600 PRINT "PER бЕСОНО........."
8618 PRINT "IT WOULD TAKE А ""JU
MBO"" JET 645"
8620 PRINT "DAYS RT 688 MPH NON-
STOP... eS"
8630 PRINT
8640 PRINT ".........ТНІНК ABOUT

IT"
зада STOP
SRVE "PLRHETS"

9001
9002 GOTO 1

"FOOD FOR THOUGHT AND

"UNDERSTANDING OF OUR

20 PRINT AT 1,3;"DECIMRL-HEXRO
ECIMRL-BINRRY",RT 3,8)"INTERCONV
ERSION"
30 PRINT RT 6,9;"SELECT INPUT”
40 PRINT RT 9,6; "ве DECIMAL”
JAT 11,60; "OX )» HEXADECIMAL" J AT
13,6) "C X)" BINARY"
50 REM initislise
60 DIM Ү6(16>
78 (ЕТ 2$-"0000000000000000"
вд LET 03е""
90 LET С%="1240"
LET Се19
DIM BK 4)
LET BC12»4056
LET В(22е256
LET BC3)5*16
КЕТ 84 )=1
REM select
INPUT AS
CLS
190 LET 09-886

200 IF 06%"8" THEN GOTO 230
210 IF Qe="**" THEN GOTO 440
220 IF й-"ж" THEN GOTO 638
230 REM dec-bin

240 PRINT AT 21,0) "DEC"

250 SLOW

268 INPUT Яв

270 FAST

288 IF LEN A®>S THEN GOTO 250

292 IF Аве"ж“ OR AS="*K" OR R$»
"$" THEN LLIST 198 .
300 PRINT RT 21,004 "
318 SCROLL
320 PRINT RT C,S-LEN ASAS

330 LET X-VRL AG
340 FOR Н”1 TO 16

358 LET Ү9(17-М2е-8ТКФ ¢X72<>INT
(X722)

360 LET Хетнт (X725

370 IF Хед THEN GOTO 390

3880 NEXT N

398 IF Хед THEM LET Y$-29( TO 1
6-N»*Y8(17-N TO >»

ада LET Ға-Үүв

418 PRINT RT C,15,R&( TO 8), ""
jReCS TO >»

420 IF Qe="kxk" THEN GOTO 440
430 IF Q$-"$" THEN GOTO 748

440 REM hex-dec

458 PRINT RT 21,0) "НЕХ"

460 SLOW

478 INPUT AS

480 FAST

492 IF LEN 8824 THEN GOTO 460
500 IF Аве"ж" ОК Аез"жж" OR R$»

"а" THEN СОТО 198

518 PRINT RT 21,8)" е

522 SCROLL

530 IF LEN Я%<4 THEN LET Ав=29‹
TO 4-LEN AS )>+AS

548 PRINT RT C,8,R$

550 (ЕТ 8-0

560 РОК Не! TO LEN AS

570 IF A@CN><>"O" THEN LET 8+6+
(CODE Аесм)-28 ужвсн»

580 NEXT М

598 LET A®@STRe 8 ;

600 PRINT RT C,S-LEN AVAS

610 IF Q$e"x" THEN GOTO 630
620 IF О®="ж%"' THEN СОТО 330

ЕТЕ

424

ЕХ BIN CONVERTER is а
је кот for conversions be-
tween the hexadecimal, decimal
and binary number systems. Conver-

. sions can be made for numbers between
_ the equivalents of 0 and 65535 decimal

from hex or decimal into the other two
systems or from binary into hex.
When RUN, the program will ask

' the user for his choice of number sys-

tem input; enter “$” for decimal, 44%”

: for hex or ''*" for binary. Then enter

the number and its conversions will be
printed on the screen. Another number
in the same system may then be entered,
or a switch to another system be effect-
ed by entering the appropriate symbol.
The display scrolls after every conver-
sion.

This excellent routine was sent by Dr
B Thornton of Salisbury, Wiltshire.
(16K ZX-81).

630
648
650
668
670

REM bin-hex

PRINT RT 21,0) "ВІН"
SLOW

INPUT AS

FAST

680 IF LEN A®>16 THEN COTO 650
,690 IF Аве"ж" OR AS="KK" OR Age
4%" THEN GOTO 198

700 PRINT RT 21,9," be

719 SCROLL `

|728 IF LEN AB<16 THEN LET Яя-2а
6 TO 16-LEN R95«n$

1738 PRINT RT C.15,8* TO Вън"
‚999 TO >

740 LET Оз=""

750 FOR M=4 TO 1 STEP -1

760 LET LeMk4

778 IF VAL ASC ТО (ред THEN СОТ
0 ese

i780 LET 8-0

|792 FOR не! TO 4

"890 IF _ASCL-N¢l ен" THEN LET $
eS+VAL Сен»

818 NEXT N

820 LET D$-CHR$ (S+28)+D8

830 LET AS=AK ТО L-4)

640 НЕХТ M

859 IF LEN 09<4 THEN LET О%»2%‹

TO 4-LEN 0%8)+0%

860 PRINT RT С,8:08

888 IF Q$-»"$" THEN GOTO 230
вод If пее "ж" THEN GOTO 558
900 SAVE "CONVERT"

919 GOTO 19

UICK TAPE, а machine code

tape routine, will allow you to

save and load 16K programs

on the ZX-81 in less than a
minute. In technical terms the pro-
gram increases the machine baud
rate to 1,500. To pul in the program
for the first time, type-in and run the
hex loader, which is the first pro-
gram in the listing. In answer to the
program prompt, type-in the
machine code listing line by line.
When you have finished the listing,
type "5" and the machine code will be
transferred to the REM statement in
line 1. Then delete the loader, line by
line, keeping the REM intact.

Type-in the second program, start-
ing at line 10. The REM in line 1
should look like the REM statement
which you have just created. When
you run this program it will SAVE
itself on to tape and then NEW auto-
matically. The machine code routine
is then stored above RAMTOP ready
for use.

To SAVE a program, type RAND
USE 32512 and to LOAD, type RAND
USR 32525. When you want to use
the program LOAD it normally and
RUN. The Basic will destroy itself
after transferring the machine code
abcve RAMTOP. The routine will
then be ready to use on your faster
computer.

Quick Tape was sent by K 5
Beddoe of Botley, Southampton and
is proving very useful.

e Machi de listi
ie LET ng-o-s Ws CD 29 е

INPUT въ 16522 7F CD 2B
IF B$="S" THEN STOP en Ge а
LET AR=AFIBE - 00 00
CLS . 38 F9
PRINT AS | OF 30

ТӨ PRINT “LENGTH= “;LEN Аир; =" 20 Ра
S o рота га С) ЕС
100 LET X=16514 D3 FF
F ‘

зае te Ag="" THEN GOTO 160 x Re
120 POKE X,16xCODE AS+CODE ЯФ t2 ла оз
) -4.76 7F 18

LET RASSAS(S ТО)» ТЕ DB Е
1

LET ж-х+ y ү
GOTO 110 p Bs
SLOU CB 24
STOP 45,47
ОБАЧЕ "FAST TAPE ROUT INS" FC 01
PRINT “FAST TAPE ROUTINE" 12
PRINT “ТО SAVE RAND USR 325 abs
7A

PRINT "TO LORD- RAND USR 325 %
40

USE 150 Bo
BANE USR 16738 | C3

POKE 16515,32
FOKE 16924.40
POKE 16528,32
POKE 16548,98
POKE 16562,67
POKE

16618,6€?

N UPDATE of the Quick Tape

А listing in our last issue is рго-

vided by D Buon of Shrewsbury.

He points out that ZX-81 computers

with the old ROM have an in-built

malfunction which prevents our routine
working.

If you enter. “RAND USR 32512”
and get a report of D/O, you have the
old ROM machine and should load the
Quick Tape program as normal, then
BREAK, and then enter the listing
published here. Finally, enter the new
line “55 POKE 16437,255”, start your
tape deck recording, and RUN.

OF

12

Гы +P COULD РБ WOUR La
ISTING. SO WOR
Ағар» COT INUE RECEIVING THIS
HEHSLETTER. SEE FRONT COVER
FOR DETAILS ON EXPIRATION DATE

List pues